What does STL stand for?

What will be the values of x, m and n after execution of the following statements?

int $x, m,n$$;$
$m=10$$;$
$n=15;$
$x=++m+n++$$;$

The value of $j$ At the end of the execution of the following C program is:
int incr (int $i$)
{
static int count $= 0$$;$
count = count $+ i$$;$
return (count);
}
main()
{
int $i, j$$;$
for ($i = 0; i <=4; i++$)
$j$ = incr ($i$)$;$
}